A number of practitioners see Northern Ireland Sign Language as
a distinct and separate language from both BSL and ISL though "many
'Anglo-Irish' Northern Irish signers argue against the use of the
acronym NISL and believe that while their variety is distinct, it
is still a part of British Sign Language."[2]

As of March 2004 the British
Government recognises only British Sign Language and Irish Sign
Language as the official sign languages used in Northern
Ireland.[1][3]